package com.t7;

/**
 * Created by xuyiwei on 2018/7/18.
 */
class Instrument{
    public void play(){

    }

    static void tune(Instrument i ){
        i.play();
    }

    static void tuneD(double d){

    }
}
public class Wind  extends  Instrument{
    public static void main(String[] args) {
        Wind wind = new Wind();
        Instrument.tune(wind);
        Instrument.tuneD(  1);
    }

}
